Build the Unity CultMath DLL independent of the commit

The tracked DLL is committed with its source, so a build that embeds the
commit can never match it. Two places named the commit: the informational
version (0.2.0+<sha>) and Source Link's commit URL in the pdb, whose content
id the DLL also carries. The csproj drops the revision from the version, and
the Unity build turns Source Link off; NuGet packs keep it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

packages/cultmath/scripts/build-unity-package.ps1

@@ -27,8 +27,10 @@ if (Test-Path -LiteralPath $outputRoot) {
   Remove-Item -LiteralPath $outputRoot -Recurse -Force
 }
 
+# The tracked DLL and pdb are committed beside their source, so neither may name a commit: Source Link
+# writes the commit SHA into the pdb, and the DLL carries that pdb's content id.
 dotnet build $projectPath -c $Configuration -f netstandard2.1 -o $buildRoot `
-  --disable-build-servers -p:UseSharedCompilation=false -p:ContinuousIntegrationBuild=true -m:1
+  --disable-build-servers -p:UseSharedCompilation=false -p:ContinuousIntegrationBuild=true -p:EnableSourceLink=false -m:1
 if ($LASTEXITCODE -ne 0) {
   throw "CultMath Unity assembly build failed with exit code $LASTEXITCODE"
 }

packages/cultmath/src/CultMath/CultMath.csproj

@@ -14,6 +14,8 @@
     <PackageReadmeFile>README.md</PackageReadmeFile>
     <NoWarn>$(NoWarn);CS8981</NoWarn>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <!-- The Unity DLL is committed beside its source, so its bytes must not name a commit. -->
+    <IncludeSourceRevisionInInformationalVersion>false</IncludeSourceRevisionInInformationalVersion>
   </PropertyGroup>
 
   <ItemGroup>